component

LM317BD2TG

Public Made by Adom

by adom

onsemi Voltage Regulators - Linear, Low Drop Out (LDO) Regulators, TO-263-2. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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LM317BD2TG

onsemi · Voltage Regulators - Linear, Low Drop Out (LDO) Regulators · TO-263-2

LM317BD2TG from onsemi, in a TO-263-2. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 Adjust passive The adjustment terminal carries IAdj, which the LM317 holds below 100 µA and constant, so Vout = Vref(1 + R2/R1) + IAdj·R2 with Vref typically 1.25 V.
2 Vout power_out The regulated output terminal supplies more than 1.5 A over an output range of 1.2 V to 37 V, and the heatsink surface (terminal 4 in the case drawing) is connected to this pin.
3 Vin power_in The input terminal accepts an input-output differential of −0.3 to 40 Vdc per the maximum ratings, and the device needs a minimum load current (ILmin, 10 mA max at VI−VO = 40 V) to maintain regulation.

Key specifications

Parameter Value
Manufacturer onsemi
Package TO-263-2
Category Power Management (PMIC)
Pins 3

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Input-Output Voltage Differential VI-VO -0.3 40 V 2
Operating Junction Temperature Range TJ -55 150 °C 2
Storage Temperature Range Tstg -65 150 °C 2
Operating Junction Temperature Range (ordering, LM317BD2TG) TJ -40 125 °C LM317BD2TG ordering table: TJ = -40° to +125°C 10
Thermal Resistance, Junction-to-Ambient, Case 936 (D2PAK-3) θJA 70 °C/W Case 936 (D2PAK-3), TA = +25°C 2
Thermal Resistance, Junction-to-Case, Case 936 (D2PAK-3) θJC 5 °C/W Case 936 (D2PAK-3) 2
Line Regulation Regline 0.01 0.04 %/V TA = +25°C, 3.0 V ≤ VI−VO ≤ 40 V 2
Line Regulation Regline 0.02 0.07 % V 3.0 V ≤ VI−VO ≤ 40 V 2
Load Regulation Regload 5 25 mV TA = +25°C, 10 mA ≤ IO ≤ Imax, VO ≤ 5.0 V 2
Load Regulation Regload 0.1 0.5 % VO TA = +25°C, 10 mA ≤ IO ≤ Imax, VO ≥ 5.0 V 2
Load Regulation Regload 20 70 mV 10 mA ≤ IO ≤ Imax, VO ≤ 5.0 V 2
Load Regulation Regload 0.3 1.5 % VO 10 mA ≤ IO ≤ Imax, VO ≥ 5.0 V 2
Thermal Regulation Regtherm 0.03 0.07 % VO/W TA = +25°C, 20 ms Pulse 2
Adjustment Pin Current IAdj 50 100 µA 2
Adjustment Pin Current Change IAdj 0.2 5 µA 2.5 V ≤ VI−VO ≤ 40 V, 10 mA ≤ IL ≤ Imax, PD ≤ Pmax 2
Reference Voltage Vref 1.2 1.25 1.3 V 3.0 V ≤ VI−VO ≤ 40 V, 10 mA ≤ IO ≤ Imax, PD ≤ Pmax 2
Minimum Load Current to Maintain Regulation ILmin 3.5 10 mA VI−VO = 40 V 2
Long-Term Stability S 0.3 1 %/1.0 kHrs. TJ = Thigh, TA = +25°C for Endpoint Measurements 2

CAD (KiCad official)

  • Symbol: LM317BD2TG
  • Footprint: Package_TO_SOT_SMD:TO-263-2
  • 3D model: TO-263-2 (KiCad packages3D, STEP)
  • 3D model files: lm317bd2tg-etched.step / lm317bd2tg-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lm317bd2tg.step / lm317bd2tg.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: onsemi datasheet (12 pp, sha256 752b2a8373998f8d, retrieved 2026-10-18, tier: lcsc)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF